Attribute-Based Access to Scalable Media in Cloud-Assisted
Content Sharing Networks
ABSTRACT:
This paper presents a novel Multi-message Ciphertext Policy Attribute-Based
Encryption (MCP-ABE) technique, and employs the MCP-ABE to design an
access control scheme for sharing scalable media based on data consumers’
attributes (e.g., age, nationality, or gender)rather than an explicit list of the
consumers’ names. The scheme is efficient and flexible because MCP-ABE allows
a content provider to specify an access policy and encrypt multiple messages
within one Ciphertext such that only the users whose attributes satisfy the access
policy can decrypt the Ciphertext. Moreover, the paper shows how to support
resource-limited mobile devices by offloading computational intensive operations
to cloud servers while without compromising data privacy
EXISTING SYSTEM:
A promising approach to access control in content sharing services is to empower
users to enforce access controls on their data directly, rather than through a central
administrator. However, this requires flexible and scalable cryptographic key
management to support complex access control policies. A native access control
solution is to assign one key for each user attribute, distribute the appropriate keys
to users who have the corresponding attributes, and encrypt the media with the
attribute keys repeatedly Another method is to classify users into different roles
based on their attributes, assign role keys to users, and then encrypt the content
using the role keys. However, this approach results in high complexity, i.e., the
number of keys for each user and the number of cipher texts for one message are
on the order of where is the number of all possible user attributes. Both of these
solutions suffer from the rigid and inflexible definition of the underlying access
control policies. A remedy to this problem is employing Ciphertext Policy
Attribute-Based Encryption (CP-ABE). In CP-ABE, a Ciphertext is embedded with
an access control policy, or access policy for short, associated with user attributes.
A recipient of the ciphertext is able to decrypt the ciphertext only if her attributes
satisfy the access policy in the ciphertext. CP-ABE can be viewed as a one-tomany public key encryption scheme and hence enables a data owner to grant
access to an unknown set of users. Nonetheless, existing CP-ABE schemes merely
deliver one encrypted message per ciphertext to all authorized users and are not
optimal for efficient sharing of scalable media.
DISADVANTAGES OF EXISTING SYSTEM:
 In an existing system solution is flexible, but it is vulnerable to collusion attack.
 The existing method is to classify users into different roles based on their
attributes, assign role keys to users, and then encrypt the content using the role
keys. However, this approach results in high complexity.
 Existing CP-ABE schemes merely deliver one encrypted message per ciphertext
to all authorized users and are not optimal for efficient sharing of scalable
media.
PROPOSED SYSTEM:
In this paper we present an access control scheme for scalable media. The scheme
has several benefits which make it especially suitable for content delivery. For
example, it is extremely scalable by allowing a data owner to grant data access
privileges based on the data consumers’ attributes (e.g., age, nationality, gender)
rather than an explicit list of user names; and it ensures data privacy and
exclusiveness of access of scalable media by employing attribute-based encryption.
For this purpose, we introduce a novel Multi-message Ciphertext Policy
AttributeBased Encryption (MCP-ABE) technique. MCP-ABE encrypts multiple
messages within one ciphertext so as to enforceflexible attribute-based access
control on scalable media. Specifically, the scheme constructs a key graph which
matches users’ access privileges, encrypts media units with the corresponding
keys, and then encrypts the key graph with MCP-ABE; only those data consumers
with the required user attributes can decrypt the encryption of the key (sub) graph
and then decrypt the encrypted media units. To cater for resource-limited mobile
devices, the scheme offloads computational intensive operations to cloud servers
while without compromising user data privacy.
ADVANTAGES OF PROPOSED SYSTEM:
 The present scheme is also secure against user collusion attacks due to use of
attribute-based encryption.
 The experiments demonstrate that the present scheme is applicable on
smartphone, especially when a cloud platform is available.
 We present an access control scheme for scalable media. The scheme has
several benefits which make it especially suitable for content delivery
SYSTEM ARCHITECTURE:
SYSTEM REQUIREMENTS:
HARDWARE REQUIREMENTS:
• System
: Pentium IV 2.4 GHz.
• Hard Disk
: 40 GB.
• Floppy Drive
: 1.44 Mb.
• Monitor
: 15 VGA Colour.
• Mouse
: Logitech.
• Ram
: 512 Mb.
SOFTWARE REQUIREMENTS:
• Operating system : - Windows XP.
• Coding Language : ASP.NET, C#.Net.
• Data Base
: SQL Server 2005
REFERENCE:
Yongdong Wu, Zhuo Wei, and Robert H. Deng “Attribute-Based Access to
Scalable
Media
in
Cloud-Assisted
Content
Sharing
Networks”-
TRANSACTIONS ON MULTIMEDIA, VOL. 15, NO. 4, JUNE 2013.
IEEE